CN105813268A - Light source system capable of automatically recognizing LED load light source - Google Patents
Light source system capable of automatically recognizing LED load light source Download PDFInfo
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- CN105813268A CN105813268A CN201610293753.5A CN201610293753A CN105813268A CN 105813268 A CN105813268 A CN 105813268A CN 201610293753 A CN201610293753 A CN 201610293753A CN 105813268 A CN105813268 A CN 105813268A
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The invention discloses a light source system capable of automatically recognizing an LED load light source. The light source system comprises an LED lamp and a light source driver connected with the LED lamp, wherein the LED lamp comprises an LED lamp unit or a plurality of LED lamp units connected in parallel; the LED lamp unit comprises an LED circuit composed of at least an LED load light source, and a load matching circuit connected with the LED circuit in parallel or in series and used for acquiring detection current of the LED lamp unit; and the light source driver is a light source driver used for outputting working current of the LED lamp unit according to the detection current. When the LED lamp units connected in parallel are added or reduced, the detection current changes, the light source driver outputs the corresponding working current of the LED lamp unit, and thus the light source driver can provide the current corresponding to the different LED lamps to drive the LED lamps to light, and the light source driver does not need to be changed.
Description
Technical field
The present invention relates to lighting technical field, more particularly, it relates to the light-source system that a kind of LED load light source identifies automatically.
Background technology
LED lamp that light-source system is made up of LED load light source and for driving the light source drive of LED load light source luminescent to constitute, the brightness of each LED load light source is that the electric current flow through to it is directly proportional.Wherein, light source drive refers to that the power supply driving LED load light source luminescent adjusts electronic device, and the arrangement mode of multiple LED load light sources, quantity kind and rated operational current are different, therefore, the light source drive that different LED load light source couplings is different, the two one_to_one corresponding.Driver is provided in the constant current that the rated current of LED load light source is suitable, but, the LED load light source rated current of different size is different, need the rated current that driver offer is different, the specification of LED load light source, kind, quantity and compound mode are different, and in order to kind and the quantity of the constant current light source drive required for providing corresponding rated current are also more many, this will be greatly increased the cost of production management, and there is no the degree of freedom used, bring great inconvenience to use.
Therefore, the specification of LED load, kind, quantity and the compound mode that include due to LED lamp are different, how automatically to identify LED lamp, in order to light source drive provides suitable electric current to drive LED load light source luminescent, is those skilled in the art's urgency technical issues that need to address.
Summary of the invention
For solving above-mentioned technical problem, the present invention provides the light-source system that a kind of LED load light source identifies automatically, can automatically identify LED load light source, so that light source drive provides suitable electric current to drive LED load light source luminescent, when LED load number, specification and kind difference, it is not necessary to change light source drive.
For achieving the above object, the present invention provides following technical scheme:
The light-source system that a kind of LED load light source identifies automatically, including LED lamp and the light source drive that is connected with described LED lamp；
Wherein, described LED lamp includes a LED lamp unit or multiple LED lamp unit parallel with one another, described LED lamp unit, including:
The LED circuit being made up of at least one LED load light source；
With described LED circuit in parallel or series, for obtaining the load matching circuit of LED lamp unit detection electric current；
Described light source drive is the light source drive for exporting described LED lamp cell operation electric current according to described detection electric current.
Preferably, in above-mentioned light-source system, described load matching circuit is the fixed resistance in parallel with described LED circuit two ends, and the resistance of described fixed resistance is more than the resistance of described LED circuit.
Preferably, in above-mentioned light-source system, described load matching circuit is the variable resistance in parallel with described LED circuit two ends, and described variable-resistance resistance is more than the resistance of described LED circuit.
Preferably, in above-mentioned light-source system, described variable resistance is photoconductive resistance.
Preferably, in above-mentioned light-source system, described load matching circuit is the circuit connected with described LED circuit, including: operational amplifier, comparator, the first switching tube, second switch pipe, load capacitance, the first resistance, the second resistance；
Wherein, one end of described first resistance is connected with the negative sense outfan of described light source drive, and the other end is connected with the inverting input of described operational amplifier；
One end of described second resistance is connected with described load capacitance, and the other end is connected with the forward outfan of described light source drive or is connected with the anode of described LED load light source；
The in-phase input end of described operational amplifier is connected with reference voltage, and outfan is connected with the base stage of described first switching tube；
The in-phase input end of described comparator is connected between described load capacitance and described second resistance, and inverting input is connected with reference voltage, and outfan is connected with the base stage of described second switch pipe；
The colelctor electrode of described first switching tube is connected with the negative electrode of described LED load light source, and emitter stage is connected with the other end of described first resistance；
The colelctor electrode of described second switch pipe is connected with the negative electrode of described LED load light source, and emitter stage is connected with the negative sense outfan of described light source drive.
Preferably, in above-mentioned light-source system, described first switching tube and described second switch pipe are audion or field-effect transistor.
Preferably, in above-mentioned light-source system, described light source drive includes:
For obtaining the load detecting circuit of LED lamp detection electric current, described LED lamp detection electric current is described LED lamp unit detection electric current sum；
Process, for described LED lamp is detected electric current, the control circuit obtaining described LED lamp cell operation electric current, be connected with described load detecting circuit；
For exporting the power conversion circuit of described LED lamp cell operation electric current, it is connected with described LED lamp unit.
Preferably, in above-mentioned light-source system, described load detecting circuit includes:
The first detection resistance that one end is connected with the anode of described power conversion circuit and described LED load light source；
One end is connected with described first other end detecting resistance, the second detection resistance of other end ground connection；
One end is connected with the negative electrode of described LED load light source, the 3rd detection resistance of other end ground connection.
Preferably, in above-mentioned light-source system, described load detecting circuit also includes:
In-phase input end connects reference power source, and inverting input is connected to the first comparator between described first detection resistance and described second detection resistance；
In-phase input end connects reference power source, and inverting input is connected to the second comparator between described 3rd detection resistance and the negative electrode of described LED load light source；
Negative electrode is connected with described control circuit, the first diode that anode is connected with the outfan of described first comparator；
Negative electrode is connected with described control circuit, the second diode that anode is connected with the outfan of described second comparator.
Preferably, in above-mentioned light-source system, described LED circuit is the LED circuit that N number of described LED load light source is composed in series, and N is more than or equal to 1.
From technique scheme it can be seen that the invention provides the light-source system that a kind of LED load light source identifies automatically, including LED lamp and the light source drive that is connected with described LED lamp；Wherein, described LED lamp includes a LED lamp unit or multiple LED lamp unit parallel with one another, described LED lamp unit, including: the LED circuit being made up of at least one LED load light source；With described LED circuit in parallel or series, for obtain LED lamp unit detection electric current load matching circuit, described LED lamp unit detection electric current be the voltage being carried in described LED load light source less than its conducting voltage time by the electric current of described LED lamp unit；Described light source drive is the light source drive for exporting described LED lamp cell operation electric current according to described detection electric current.
When applying the light-source system that LED load light source provided by the invention identifies automatically, light source drive is gradually increased the voltage added by LED lamp is started from scratch, when the undertension of be added in LED circuit is to light each LED load light source, the electric current flowing through load matching circuit is detected by light source drive as detection electric current, light source drive exports LED lamp cell operation electric current according to by the detection electric current of LED load light source so that the normal operation under rated current of the LED load light source in LED lamp unit.When increasing or reduce LED lamp unit in parallel, detection electric current changes, the operating current of the LED lamp unit that light source drive output is corresponding, achieve for different LED lamp, light source drive all can provide the electric current corresponding with LED lamp to drive it luminous, it is not necessary to changes light source drive.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
A kind of light-source system schematic diagram that Fig. 1 provides for the embodiment of the present invention；
The VA characteristic curve figure of the LED load light source that Fig. 2 provides for the embodiment of the present invention；
A kind of light-source system circuit diagram that Fig. 3 provides for the embodiment of the present invention；
The another kind of light-source system circuit diagram that Fig. 4 provides for the embodiment of the present invention；
The another kind of light-source system circuit diagram that Fig. 5 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Refer to a kind of light-source system schematic diagram that Fig. 1, Fig. 1 provide for the embodiment of the present invention.
In a kind of detailed description of the invention, the invention provides the light-source system that a kind of LED load light source identifies automatically, including LED lamp and the light source drive that is connected with described LED lamp；Wherein, a LED lamp unit or multiple LED lamp unit 100 parallel with one another, described LED lamp unit 100, including: the LED circuit 101 being made up of at least one LED load light source；With described LED circuit 101 in parallel or series, detect the load matching circuit 102 of electric current for obtaining LED lamp unit 100, described LED lamp unit detection electric current be the voltage being carried in described LED load light source less than its conducting voltage time by the electric current of described LED lamp unit 100；Described light source drive is the light source drive for exporting described LED lamp cell operation electric current according to described detection electric current.
It is pointed out that and can include a LED load light source in LED circuit 101, it is also possible to include multiple LED load light source, when LED circuit 101 is made up of multiple LED load light sources, multiple LED load light sources are in series or in parallel, all within protection domain.In LED lamp unit 100, each LED circuit 101 load matching circuit 102 all in parallel or in series, load matching circuit 102 is used for obtaining LED lamp unit detection electric current, described LED lamp unit detection electric current be the voltage being carried in described LED load light source less than its conducting voltage time by the electric current of described LED lamp unit, namely obtain the detection electric current by described LED circuit 101.At least one LED lamp unit 100 constitutes LED lamp, multiple LED lamp unit 100 are parallel with one another, light source drive is connected with LED lamp unit 100, the detection electric current by described LED load light source can be obtained, the i.e. detection electric current of each lamp unit, the detection electric current of multiple lamp units is analyzed, exports the operating current of each LED lamp unit 100 so that LED load is lighted.
Light source drive is gradually increased the voltage added by LED lamp is started from scratch, when the undertension of be added in LED circuit is to light each LED load light source, the electric current flowing through load matching circuit is detected by light source drive as detection electric current, light source drive exports LED lamp cell operation electric current according to by the detection electric current of LED load light source so that the normal operation under rated current of the LED load light source in LED lamp unit.When increasing or reduce LED lamp unit in parallel, detection electric current changes, the operating current of the LED lamp unit that light source drive output is corresponding, achieve for different LED lamp, light source drive all can provide the electric current corresponding with LED lamp to drive it luminous, it is not necessary to changes light source drive.
The core concept of the present invention is in LED circuit 101 load matching circuit 102 in parallel or in series, detected by the electric current of lamp unit 100 by load matching circuit 102, obtain detection electric current, light source drive provides the operating current of LED lamp unit 100 according to detection electric current, realize when LED load number, specification and kind difference, it is not necessary to change the purpose of light source drive.
Further, referring to Fig. 3, Fig. 4, Fig. 5, described light source drive includes:
For obtaining the load detecting circuit 103 of LED lamp detection electric current, described LED lamp detection electric current is described LED lamp unit detection electric current sum；
Process, for described LED lamp is detected electric current, the control circuit 104 obtaining described LED lamp cell operation electric current, be connected with described load detecting circuit 103；
For exporting the power conversion circuit 105 of described LED lamp cell operation electric current, it is connected with described LED lamp unit.
Wherein, described load detecting circuit 103 includes: the first detection resistance 11 that one end is connected with the anode of described power conversion circuit 105 and described LED load light source；One end is connected with described first other end detecting resistance 11, the second detection resistance 12 of other end ground connection；One end is connected with the negative electrode of described LED load light source, the 3rd detection resistance 13 of other end ground connection.
Described load detecting circuit 103 also includes: in-phase input end connects reference power source, and inverting input is connected to the first comparator 15 between described first detection resistance 11 and described second detection resistance 12；In-phase input end connects reference power source, and inverting input is connected to the second comparator 14 between described 3rd detection resistance 13 and the negative electrode of described LED load light source；Negative electrode is connected with described control circuit 104, the first diode 17 that anode is connected with the outfan of described first comparator 15；Negative electrode is connected with described control circuit 104, the second diode 16 that anode is connected with the outfan of described second comparator 14.Wherein, reference power source is provided by external power source.
Further, described LED circuit 101 is that the LED circuit 101, N that is composed in series of N number of described LED load light source is more than or equal to 1.Certainly, the LED load number of light sources in LED circuit 101 does not limit, and LED load light source can be multiple series connection, it is also possible to for multiple parallel connections, it is also possible to be connected for connection in series-parallel mixing, all within protection domain.
The operation principle of light-source system that provided by the invention LED load light source automatically identify is presented herein below.
Refer to the VA characteristic curve figure of the LED load light source that Fig. 2, Fig. 2 provide for the embodiment of the present invention.nullIf LED load light source provided by the invention is diode，Make use of the on state characteristic of LED load light source，The load matching circuit 102 in LED circuit 101 parallel connection，The resistance of load matching circuit 102 becomes corresponding relation with the electric current needed for LED circuit 101，When LED load light source does not turn on，Such as，Flow through the electric current of LED load light source less than threshold values 1A，The voltage that LED lamp applies is unsatisfactory for the turn-on condition of LED load light source by light source drive，But the voltage that LED lamp applies has been added in the LED circuit 101 of LED lamp unit 100，Finally，Flow through the electric current of LED lamp unit 100 and flow through the 3rd detection resistance 13，Namely the electric current flowing through the 3rd detection resistance 13 is detected electric current and detects by load detecting circuit 103，The now light source drive output size of current to LED lamp is obtained by control circuit 104 and power conversion circuit 105，The i.e. operating current of described LED lamp unit 100，Make LED load light source igniting.
When the LED lamp unit 100 in LED lamp increases or reduces, namely the electric current flowing through the 3rd detection resistance 13 is detected electric current and detects by load detecting circuit 103, according to detecting the size of electric current and the alive size corresponding with detection electric current, obtain the resistance value of LED lamp, calculating the quantity obtaining LED lamp unit 100, LED driver provides and meets voltage or the electric current that LED lamp unit 100 requires.
Three specific embodiments provided for the core concept according to the present invention below:
Embodiment one
Refer to Fig. 3, a kind of light-source system circuit diagram that Fig. 3 provides for the embodiment of the present invention, on the basis of above-mentioned embodiment, optionally, load matching circuit 102 is fixed resistance, described fixed resistance is in parallel with described LED circuit 101 two ends, the resistance of described fixed resistance is more than the resistance of described LED circuit, the resistance of fixed resistance is preferably the resistance much larger than LED circuit, in order to avoid when normal operation, a large amount of electric currents tap from fixed resistance, cause the current reduction of LED circuit, reduce the luminous efficiency of LED load light source.
In the present embodiment, LED lamp is made up of 4 LED lamp unit 100, LED lamp unit 100 includes 4 LED load light sources and the fixed resistance with LED load light source branch circuit parallel connection of series connection, and other parts of circuit refer to above-mentioned embodiment, does not repeat them here.
After light source drive starts, the forward voltage being carried in LED lamp is gradually increased, when forward voltage is lower than threshold values 1 (being generally 1.5V) time, LED load light source is not turned on, when forward voltage is more than threshold values 1, time less than threshold values 2 (being generally 2.6V), LED load light source starts slight conducting, when forward voltage is more than threshold values 2 time, LED load light source starts fully on.The rated voltage of each LED load light source is 3V, and voltage when LED circuit 101 is fully loaded with work is 12V, and electric current is 60mA.When light source drive just starts time, export 5V voltage, it is 1.25V that this voltage divides the voltage on each LED load light source equally, this voltage less than the conducting voltage of LED load light source, LED load light source completely by.At LED load light source parallel connection fixed resistance, when fixed resistance is 5K ohm, 5V voltage is added in fixed resistance, produce the detection electric current of 1mA, detection electric current flows through the 3rd detection resistance 13 in light source drive, load detecting circuit 103 obtains the size of detection electric current, and load detecting circuit 103 sends current controling signal to control circuit 104, and control circuit 104 controls power conversion circuit 105 and generates the electric current of 12V/60mA.When one of them LED lamp unit 100 breaks down or removes, the electric current flowing through power supply driver reduces, LED lamp unit 100 for ensureing each parallel branch can be operated in rational current range, and output electric current can be adjusted to 180mA by light source drive accordingly.
Embodiment two
Refer to Fig. 4, the another kind of light-source system circuit diagram that Fig. 4 provides for the embodiment of the present invention, on the basis of above-mentioned embodiment, load matching circuit 102 is variable resistance, described variable resistance is in parallel with described LED circuit 101 two ends, and described variable-resistance resistance is more than the resistance of described LED circuit.Its operation principle does not repeat them here.
Optionally, variable resistance is photoconductive resistance, can also be so other variable resistance, for instance slide rheostat.User can according to the brightness demand of oneself, and by regulating the resistance of this resistance, power supply driver can regulate the size of output electric current accordingly, reaches the demand of user, it is possible to achieve regulates the purpose of LED lamp brightness.
Embodiment three
Refer to the another kind of light-source system circuit diagram that Fig. 5, Fig. 5 provide for the embodiment of the present invention.On the basis of above-mentioned embodiment, described load matching circuit 102 is connected with described LED circuit 101；Described load matching circuit 102 includes: operational amplifier 23, comparator the 24, first switching tube 25, second switch pipe 26, load capacitance, first resistance the 21, second resistance 22；Wherein, described one end of first resistance 21 is connected with the negative sense outfan of described light source drive, and the other end is connected with the inverting input of described operational amplifier 23；One end of described second resistance 22 is connected with described load capacitance, and the other end is connected with the forward outfan of described light source drive or is connected with the anode of described LED load light source；The in-phase input end of described operational amplifier 23 is connected with reference voltage, and outfan is connected with the base stage of described first switching tube 25；The in-phase input end of described comparator 24 is connected between described load capacitance and described second resistance 22, and inverting input is connected with reference voltage, and outfan is connected with the base stage of described second switch pipe 26；The colelctor electrode of described first switching tube 25 is connected with the negative electrode of described LED load light source, and emitter stage is connected with the other end of described first resistance 21；The colelctor electrode of described second switch pipe 26 is connected with the negative electrode of described LED load light source, and emitter stage is connected with the negative sense outfan of described light source drive.
Further, described first switching tube 25 is audion or field-effect transistor with described second switch pipe 26.
nullLED lamp is applied more than the conducting voltage of LED circuit 101 by light source drive，The first switching tube 25 in load matching circuit 102 enters amplification region，Second switch pipe 26 is operated in cut-off region because of capacitance-resistance charging time delay，Second switch pipe 26 is operated in saturation region afterwards，The electric current flowing through LED circuit 101 is limited under a very little electric current by the first switching tube 25，Such as it is limited in 1mA，Final LED lamp electric current flows through the 3rd detection resistance 13 in light source drive，Load detecting circuit 103 detects resistance 13 to the 3rd and detects，The operating current exporting described LED lamp unit 100 can be obtained，Now the output voltage of light source drive starts to reduce，After being operated in saturation region Deng second switch pipe 26，Light source drive provides suitable curtage for LED lamp.
Because the load matching circuit 102 in LED lamp unit 100 and LED circuit 101 are series relationship, so after LED circuit 101 breaks down, when detection-phase, load matching circuit 102 does not have electric current to flow through, cause that the output electric current of light source drive reduces.LED drive power is when detection-phase, and load detecting circuit 103 can detect the number of the LED lamp unit 100 of actual health by the size of current in loop, and LED drive power can export suitable curtage accordingly.
The light-source system that LED load light source provided by the invention identifies automatically, before use without knowing the size of current needed for LED lamp unit, detection electric current is obtained through the detection of load detecting circuit in a flash by what open at light source drive, and then obtain the resistance value of LED lamp, obtain the working current value needed for LED lamp, light source drive exports the curtage value needed for LED lamp accurately, achieve the purpose of the different LED lamp of same light source driver coupling, reduce and produce and maintenance cost.When the internal LED lamp unit of LED lamp breaks down, load matching circuit can allow the output electric current of light source drive make corresponding adjustment, make the LED load light source works in LED lamp in suitable electric current or voltage, simultaneously, whole adjustment process is all that non-lit up at LED load light source or only faint light situation carries out, and user will not be shone into visual impact.
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. the light-source system that a LED load light source identifies automatically, it is characterised in that include LED lamp and the light source drive being connected with described LED lamp；
Wherein, described LED lamp includes a LED lamp unit or multiple LED lamp unit parallel with one another, described LED lamp unit, including:
The LED circuit being made up of at least one LED load light source；
With described LED circuit in parallel or series, for obtaining the load matching circuit of LED lamp unit detection electric current；
Described light source drive is the light source drive for exporting described LED lamp cell operation electric current according to described detection electric current.
2. light-source system as claimed in claim 1, it is characterised in that described load matching circuit is the fixed resistance in parallel with described LED circuit two ends, and the resistance of described fixed resistance is more than the resistance of described LED circuit.
3. light-source system as claimed in claim 1, it is characterised in that described load matching circuit is the variable resistance in parallel with described LED circuit two ends, and described variable-resistance resistance is more than the resistance of described LED circuit.
4. light-source system as claimed in claim 3, it is characterised in that described variable resistance is photoconductive resistance.
5. the light-source system described in claim 1, it is characterised in that described load matching circuit is the circuit connected with described LED circuit, including: operational amplifier, comparator, the first switching tube, second switch pipe, load capacitance, the first resistance, the second resistance；
Wherein, one end of described first resistance is connected with the negative sense outfan of described light source drive, and the other end is connected with the inverting input of described operational amplifier；
One end of described second resistance is connected with described load capacitance, and the other end is connected with the forward outfan of described light source drive or is connected with the anode of described LED load light source；
The in-phase input end of described operational amplifier is connected with reference voltage, and outfan is connected with the base stage of described first switching tube；
The in-phase input end of described comparator is connected between described load capacitance and described second resistance, and inverting input is connected with reference voltage, and outfan is connected with the base stage of described second switch pipe；
The colelctor electrode of described first switching tube is connected with the negative electrode of described LED load light source, and emitter stage is connected with the other end of described first resistance；
The colelctor electrode of described second switch pipe is connected with the negative electrode of described LED load light source, and emitter stage is connected with the negative sense outfan of described light source drive.
6. light-source system as claimed in claim 5, it is characterised in that described first switching tube and described second switch pipe are audion or field-effect transistor.
7. the light-source system as described in any one of claim 1 to 6, it is characterised in that described light source drive includes:
For obtaining the load detecting circuit of LED lamp detection electric current, described LED lamp detection electric current is described LED lamp unit detection electric current sum；
Process, for described LED lamp is detected electric current, the control circuit obtaining described LED lamp cell operation electric current, be connected with described load detecting circuit；
For exporting the power conversion circuit of described LED lamp cell operation electric current, it is connected with described LED lamp unit.
8. light-source system as claimed in claim 7, it is characterised in that described load detecting circuit includes:
The first detection resistance that one end is connected with the anode of described power conversion circuit and described LED load light source；
One end is connected with described first other end detecting resistance, the second detection resistance of other end ground connection；
One end is connected with the negative electrode of described LED load light source, the 3rd detection resistance of other end ground connection.
9. light-source system as claimed in claim 8, it is characterised in that described load detecting circuit also includes:
In-phase input end connects reference power source, and inverting input is connected to the first comparator between described first detection resistance and described second detection resistance；
In-phase input end connects reference power source, and inverting input is connected to the second comparator between described 3rd detection resistance and the negative electrode of described LED load light source；
Negative electrode is connected with described control circuit, the first diode that anode is connected with the outfan of described first comparator；
Negative electrode is connected with described control circuit, the second diode that anode is connected with the outfan of described second comparator.
10. light-source system as claimed in claim 9, it is characterised in that described LED circuit is the LED circuit that N number of described LED load light source is composed in series, and N is more than or equal to 1.
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| CN105827111A (en) * | 2016-05-27 | 2016-08-03 | 深圳市赢新光电发展有限公司 | Power supply circuit for automatically matching load parallel set number and operation method thereof |
| CN110366291A (en) * | 2019-07-05 | 2019-10-22 | 欧普照明股份有限公司 | With more specification light source load Auto-matchings for electric drive, lamps and lanterns and driving method |
| CN110461056A (en) * | 2019-07-05 | 2019-11-15 | 欧普照明股份有限公司 | The more specification light source loads of Auto-matching for electric drive, lamps and lanterns and driving method |
| CN112637991A (en) * | 2019-09-20 | 2021-04-09 | 台达电子工业股份有限公司 | Power supply applied to light emitting diode and operation method thereof |
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